SOLUTION: On the first day of school, the percentage of boys in a particular class is 60%. During the school year, six girls move away, and are replaced in the class by six boys; this makes

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Question 198240This question is from textbook
: On the first day of school, the percentage of boys in a particular class is 60%. During the school year, six girls move away, and are replaced in the class by six boys; this makes the class roster 75% boys. Find the number of boys and girls in the class on the first day of school. This question is from textbook

Answer by anantha(86) About Me  (Show Source):
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sol;
let the total numbe of students in a class be 100
60%of the class=60/100*100=60
boys in the class=60
total students in the class=100
girls in the class=100-60=40
later 6 girls are move away
now toal number of students=100-6=94
and againg 6 girls are replace by 6 boys
now total number of students in the class=94+6=100
now 75% of the class=75/100*100=75
now number of boys in a class =75
number of girls in the class=100-75=25